Revision 1819

- Convert all strings coming from the NNTPGrab Core to the Qt Frontend to the QString native character encoding (which isn't UTF-8 on Windows). Fixes an issue where names of collections and files could get malformed if they contain non-UTF8 characters. Closes #72- When importing files with special characters, some invalid JSON-RPC messages could get sent to external frontends. Fixed- Add a Content-Length header to HTTP requests in the JSON-RPC plugin Patch by chrashoverraid. Closes #74- When connecting to a NNTPGrab Server using the 32bit Windows frontend, the frontend could crash. Fixed. Closes #70